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1. Select Scenario
Choose one of the landuse scenarios and then select which media to
assess under the "Select Media" list that is displayed.
2. Select PRG Type
Select the type of PRG desired. If "Site Specific" is selected go to step 3. If "Defaults"
is selected go to step 4.
3. Select Chemical Info Type
The "Select Chemical Info Type" drop down menu will appear. Select either "Database hierarchy defaults"
or "User-provided". "Database hierarchy defaults" uses the toxicity values and the chemical-specific
parameters as selected by the hierarchies described in sections 2.3 and 2.4 of the User's Guide,
respectively. "User-provided" gives the option to change toxicity values and chemical-specific parameters.
4. Select Individual Chemicals
Select one or more contaminants for PRG calculation. Select a contaminant by highlighting it
in the left box and click the ">>" button to move it to the box on the right. Contaminants in the
box on the right will be used for PRG calculation. Highlight multiple contaminants at once by using the
"Shift" key. Remove a contaminant from the right box by highlighting it and clicking the "<<" button.
You may choose all contaminants by checking the "ALL" box. The calculator run time will correspond with the
number of contaminants selected.
5. Click Retrieve
Click the "Retrieve" button at the bottom of the page. If "Default" PRGs are being calculated go to step 8.
If "Site Specific" PRGs are being calculated go to step 6.
6. Site-specific Parameters
Enter site-specific toxicity values, chemical-specific parameters and exposure parameters.
7. Click Retrieve
Click the "Retrieve" button at the bottom of the page.
8. View Results
Review your results. In order to save a copy of your input parameters and PRG results choose from the following options:
- Click "Output to Spreadsheet" to save in spreadsheet (.xls) format
- Click "Output to PDF" to save in PDF (.pdf) format
- Select "Print" from the File Menu or press CTRL+P to print from your browser.
Once this has been done, you will have a preliminary record of your calculations, including all of the inputs
and screening levels. You now have a dated record of your site-specific PRGs, including the inputs.
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